The Lift Pump 4BT (Part No. 3970880) is a reliable fuel lift/transfer pump designed for use with Cummins diesel engines, especially the 4B, 4BT, 4BTA, 6B and 6BT series. It ensures steady fuel supply from the tank to the injection system, promoting smooth engine starting and consistent performance.
Where It Is Used
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Cummins 4BT and 6BT diesel engines in generators, industrial machines and agricultural equipment
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Heavy machinery with mechanical diesel fuel systems
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Engine applications requiring dependable fuel delivery for proper combustion and performance
Key Functions
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Fuel delivery: Pumps fuel from the tank to the engine’s injection pump at the correct pressure
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Prevents fuel starvation: Ensures consistent flow to avoid engine sputtering or hard starts
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Durable mechanical design: Works reliably under heavy use and vibration environments
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OEM replacement fit: Matches original specifications for Cummins B‑series engines
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